File: overflow.c

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llvm-toolchain-18 1%3A18.1.8-18
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// RUN: %clang_safestack %s -o %t
// RUN: %run %t

// RUN: %clang_nosafestack -fno-stack-protector %s -o %t
// RUN: not %run %t

// Test that buffer overflows on the unsafe stack do not affect variables on the
// safe stack.

// REQUIRES: stable-runtime

extern void *memset(void *, int, __typeof__(sizeof(0)));

__attribute__((noinline))
void fct(volatile int *buffer)
{
  memset(buffer - 1, 0, 7 * sizeof(int));
}

int main(int argc, char **argv)
{
  int prebuf[7];
  int value1 = 42;
  int buffer[5];
  int value2 = 42;
  int postbuf[7];
  fct(prebuf + 1);
  fct(postbuf + 1);
  fct(buffer);
  return value1 != 42 || value2 != 42;
}